Fortress Power Envy 10K
For grid-tied homes that want an outdoor hybrid with export, backup and US-based support at a lower price than the Envy True 12.
Wind & Sun $3,899$3,899
4.1/5
For off-grid homes and cabins that want 6 kW of 240 V with a large solar input at a low price. A strong rival to the EG4 6000XP.
- 6 kWOutput
- 48 VBattery
- 9,000 WSolar input
- 75 WIdle draw
- 5 yearsWarranty
Check price at Amazon
Price checked October 23, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Makes 120/240 V from one unit and takes 9,000 W of panels
- 550 V input allows long strings and thinner PV wire
- Separate generator port and closed-loop lithium communication
- Up to 9 units in parallel as needs grow
Cons
- About 75 W idle draw uses close to 2 kWh a day
- Indoor IP20 enclosure needs a dry, sheltered spot
- Certified as off-grid; utility export is not confirmed
The Growatt SPE US family
Every Growatt SPE US model we rank, smallest first. Ratings compare each against its own output.
| Model | Output | Rating | Price |
|---|---|---|---|
| Growatt SPE 6000 US (this one) | 6 kW | 4.1/5 | $1,399 |
| Growatt SPE 12000 US | 12 kW | 4.2/5 | $1,769 |
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its output. How we rank explains each one.
Specifications
| Model number | SPE 6000 US |
|---|---|
| Output | |
| Output voltage | 120/240 V split-phase |
| Continuous output | 6,000 W |
| Peak efficiency | 95% |
| CEC efficiency | 94.5% |
| Idle draw | 75 W |
| Transfer time | 20 ms |
| Parallel units | Up to 9 units |
| Solar | |
| Max PV power | 9,000 W |
| Max PV voltage (Voc) | 550 V |
| MPPT range | 60 to 480 V |
| MPPT trackers | 2 |
| PV current per tracker | 22 A |
| Runs without battery | Yes |
| Battery and grid | |
| Battery voltage | 48 V |
| Battery types | Lithium, lead-acid |
| Max charge current | 140 A |
| AC charge current | 140 A |
| Battery communication | Yes |
| Generator input | Yes |
| UL 1741 | Yes |
| Build | |
| App monitoring | Optional add-on |
| Enclosure | IP20 |
| Dimensions | 550 x 465 x 150 mm |
| Weight | 47.4 lb |
| Warranty | 5 years |
| Released | 2025-09 |
Alternatives in this output
SunGoldPower Freedom Pro 16K-48
A very large off-grid split-phase inverter for big homes, farms and shops that want one unit instead of a stack.
SunGoldPower $2,699$2,699
Sol-Ark 15K-2P
For homeowners and installers who want a long-proven whole-home hybrid with strong support. It costs more than EG4 for similar output.
Amazon Shop Solar Kits $4,999$4,999
Compare
Compare the Growatt SPE 6000 US with any other hybrid solar inverter →
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